diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Db/Adapter/Exception.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Db/Adapter/Exception.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,57 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Db
+ * @subpackage Adapter
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Exception.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * Zend_Db_Exception
+ */
+require_once 'Zend/Db/Exception.php';
+
+/**
+ * @category   Zend
+ * @package    Zend_Db
+ * @subpackage Adapter
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Db_Adapter_Exception extends Zend_Db_Exception
+{
+    protected $_chainedException = null;
+
+    public function __construct($message = '', $code = 0, Exception $e = null)
+    {
+        if ($e && (0 === $code)) {
+            $code = $e->getCode();
+        }
+        parent::__construct($message, $code, $e);
+    }
+
+    public function hasChainedException()
+    {
+        return ($this->_previous !== null);
+    }
+
+    public function getChainedException()
+    {
+        return $this->getPrevious();
+    }
+
+}